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Random Speed Pulse signal values on AVIC-F88DAB

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Hi All

I've spent the weekend fitting an F88DAB to my Porsche using the Connects2 wiring loom and fascia kit.  In general, all's good, apart from when I drove to work this morning, I noticed that the speed pulse values are completely random.  They do go back to zero when I stop, but fluctuate all over the place at constant speed, go up or down when I accelerate - basically random.  This is completely confusing the sat nav of course, which can't calibrate itself.  The Connects2 kit had a specific wire for the speed pulse, and the fact it drops to zero when I stop suggests its not a wiring problem - or it would seem a strange coincidence if it was picking up something else which dropped to zero when I stopped.

Any ideas - completely confused at the moment.....

ta

pete S

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